Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows From Operating Activities
Net loss	$ (3,332)	$ (7,584)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	902	27
(Gain) loss on sale of property and equipment	381	(513)
Change in fair value of liability	(26)	(135)
Stock-based compensation expense	222	1,991
Extinguishment of note payable		(2,748)
Amortization of note discount	877	5,110
Termination of management agreements		364
Change in operating assets and liabilities
Prepaid expenses and other current assets	63	(134)
Intangible digital assets	16	(22)
Management agreement termination liability	(90)
Right of use asset	17	54
Operating lease liability	(17)	(56)
Other assets	(2)	122
Accounts payable	457	250
Accrued expenses	122	50
Net cash used in operating activities	(381)	(3,224)
Cash Flows From Investing Activities
Purchase of property and equipment	(375)	(556)
Proceeds from sale of property and equipment	439	431
Deposits made on property and equipment	(38)	(1,817)
Refund of security deposit	34
Net cash provided by (used in) investing activities	60	(1,942)
Cash Flows From Financing Activities
Proceeds from SBA PPP loan	111
Proceeds from sale of common stock		525
Payment of deferred offering costs		(70)
Proceeds from sale of stock under equity purchase agreement, net of issuance costs		4,842
Sale of preferred stock, net of issuance costs		1,990
Repayment of notes payable		(210)
Proceeds from exercise of warrants		120
Warrant buybacks		(14)
Net cash provided by financing activities	111	7,183
Net change in cash and cash equivalents	(210)	2,017
Cash and cash equivalents, beginning of period	216	96
Cash and cash equivalents, end of period	6	2,113
Supplemental disclosure of cash flow information
Cash paid for interest		3
Cash paid for income tax
Non-cash investing and financing activities
Deemed dividend on warrant modification and beneficial conversion feature of preferred stock		1,005
Cumulative effect adjustment related to ASU adoption		3
Conversion of notes payable into common stock	929	2,147
Repayment of note payable and interest through the issuance of shares under the equity purchase agreement		354
Acquisition of miners through common stock		312
Conversion of Series C convertible preferred stock into common stock		28
Reclassification of deferred offering costs		$ 70